Disable the annoying LEDs for Lenovo laptops

thinkpad_disable_lights.sh

#!/usr/bin/env bash

# ref: https://www.reddit.com/r/thinkpad/comments/7n1bfz/t570_annoying_red_led/

#  About that byte that specifies the state of the LEDs: first nibble represents state, and can be:
#     0 - off
#     8 - on
#     c - blink

# Last nibble represents which LED, can be from 0-15, and known ones (on my laptop at least) are:
#     0 - power
#     6 - Fn Lock
#     7 - sleep (I don't have it, but some models do)
#     a - red dot on the back
#     e - microphone

sudo modprobe -r ec_sys
sudo modprobe ec_sys write_support=1

# turn off the red dot on back
echo -n -e "\x0a" | sudo dd of="/sys/kernel/debug/ec/ec0/io" bs=1 seek=12 count=1 conv=notrunc 2> /dev/null

# turn off the FnLock light
echo -n -e "\x06" | sudo dd of="/sys/kernel/debug/ec/ec0/io" bs=1 seek=12 count=1 conv=notrunc 2> /dev/null

# turn off the power light
echo -n -e "\x00" | sudo dd of="/sys/kernel/debug/ec/ec0/io" bs=1 seek=12 count=1 conv=notrunc 2> /dev/null

sudo modprobe -r ec_sys